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在中学里讲授近似计算,是要教给学生有关近似数的初步知识与计算技能,不是研究近似计算的理论与计算精密误差,因此我们认为教学的要求,主要在使学生:掌握近似数的有关概念;掌握数字计算的法则。教学的主要内容大致如下。一、近似数的概念。1.近似数的产生(计量、测量、计算)以及怎样判定一个数是近似数还是准确数。2.近似数的三种截取方法(去尾法、收尾法、四舍五入法)及其在实际问题中的应用。3.表示近似数的精确度的方法,能合理表达
To teach approximate calculations in secondary schools is to teach students the initial knowledge and calculation skills of approximations rather than to study the theoretical calculations and computational errors of approximation calculations. Therefore, we think that the requirements of teaching are mainly to enable students to master approximations Concept; master the rules of digital computing. The main content of teaching is as follows. First, the concept of approximate number. 1. Generation of approximations (measurement, measurement, calculation) and how to determine whether a number is an approximation or an exact one. 2. Approximate number of three interception methods (to tail method, the tail method, rounding method) and its application in practical problems. 3. The method of expressing the accuracy of the approximation can be reasonably expressed